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Finding the Fourth Proportional to 72,410.80, 108,529.80 and 64,980.40

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Solution

The fourth proportional to 72,410.80, 108,529.80 and 64,980.40 is: 97,393.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,410.80 : 108,529.80 = 64,980.40 : x
  2. Step 2: Convert to fraction form
    72,410.80/108,529.80 = 64,980.40/x
  3. Step 3: Cross multiply
    72,410.80x = 108,529.80 × 64,980.40
  4. Step 4: Simplify right side
    72,410.80x = 7,052,309,815.92
  5. Step 5: Solve for x
    x = 7,052,309,815.92/72,410.80
  6. Step 6: Final answer
    x = 97,393.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.